Using Lookup functions Abinitio PDL's

I've been trying to use lookup functions in PDL by specifying lookup file using m_catalog_add, lookup_load but pdl functions are not able to find the Lookup label. Please assist what needs to be done in order to be able to use data file as a lookup in metaprogramming ?

I know that an alternative method is to use grep command. But can we use lookup functions in PDL's?

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